diff --git a/src/sourceFiles/index.ts b/src/sourceFiles/index.ts
index 9663d7563..370ca673b 100644
--- a/src/sourceFiles/index.ts
+++ b/src/sourceFiles/index.ts
@@ -592,12 +592,14 @@ export namespace SourceFilesModel {
     export interface MergeBranchRequest {
         deleteAfterMerge?: boolean;
         sourceBranchId: number;
+        acceptSourceChanges?: boolean;
         dryRun?: boolean;
     }
 
     export interface MergeBranchAttributes {
         sourceBranchId: number;
         deleteAfterMerge: boolean;
+        acceptSourceChanges?: boolean;
     }
 
     export interface MergeBranchSummary {
diff --git a/tests/sourceFiles/api.test.ts b/tests/sourceFiles/api.test.ts
index cebbc30ca..8fa207dc5 100644
--- a/tests/sourceFiles/api.test.ts
+++ b/tests/sourceFiles/api.test.ts
@@ -167,6 +167,7 @@ describe('Source Files API', () => {
                 `/projects/${projectId}/branches/${branchId}/merges`,
                 {
                     sourceBranchId,
+                    acceptSourceChanges: true,
                 },
                 {
                     reqheaders: {
@@ -548,6 +549,7 @@ describe('Source Files API', () => {
     it('Merge branch', async () => {
         const mergeStatus = await api.mergeBranch(projectId, branchId, {
             sourceBranchId,
+            acceptSourceChanges: true,
         });
         expect(mergeStatus.data.identifier).toBe(mergeBranchId);
     });